Improved rubber compound



Extent mm;

MOSHERA. SUTHERLAND, OF NEW YORK, NY.

p 3 Letters Patent No. 95,162,

dated September 21, 1869.

IMPROVED RUBBER COMPOUND. I

The Shedulereferr'ed to in these Letters Patent and making part of th i To all whoin it may concern Be it known that I, Mosnen A. SUTHERLAND, of

the city, county, and State of New'York, haveinvented a. new and improved Rubber Compound; and

1 do hereby declare that the following is a full, clear,

and exact description of thesame.

This invention consists in a new rubber compound, so called, which is composed of India rubber, or caoutchouc, and asbestos, with a quantity of sulphur sufficient to effect a. proper vulcanization of the mass. i

To produce a compound of sufficient hardness to answer fora great variety of purposes, I find-that the ibllo ving proportions of i the above-named ingredients will 1 answer, to wit:

Orude rubber or caoutchouc, say, eight pounds. Asbestos, say, eight pounds.

Sulphur, say, one pound. p The mixing togetherof the ingredients may be acoomplished in any suitable manner; for instance, in

. the wayjusually practised in this art, thatis to say, the pulverized or disintegrated asbestos is mixed with p the rubber by running both together through heated rollers. Then the sulphur] may be mixed with -this compound in the same way. i 1

. After the ingredients have been properly incorpo-,

rated, I put the compound into moulds of the requisite shape, and effect thevulcanization of the compound in one of the modes at present practised. I prefer to place-the moulds in a steam-heater, and vulcanize with steam of say about eighty pounds pressure.

Asbestos, it is well known, is of a fibrous nature, and, when properly disintegrated, it has a tendency to holdthe mass together. It is, moreover, a very poor conductor of heat, and, therefore, my compound is well adapted for use when it is to be subjected to heat. For instance, it provides a good steam-packing.

used may be considerably varied. For instance, I can take asbestos, eight pounds; rubber, four pounds; sulphur, half a pound, and incorporate them, and vul- 'canize, and I obtain a harder compound.

I do not, therefore, limit myself to any particular pound.

the rubber, the compound increases or decreases in .hardness.

What I claim as my invention, and desire to soon-re by Letters Patent, 1's- A compound, composed of the ingredients'in the proportions and prepared in substantially the manner herein set forth.

Witnesses: MOSHER A. SUTHERLAND.

M; M. Lrvnves'ron,

l.. B. BEECHER.

-As before stated, the proportions of the ingredients proportions of the several ingredients, norto the mannor of mixing them together; nor to the pressure of a steam or degree of heatused for vulcanizing the com- In proportion as the asbestos is used in regard to 

